Plans sometimes have exclusions for coverage related to "illegal acts" that could leave people on the hook for at least part of their medical costs. But health policy experts said it's unclear how common these clauses are or when they're used.

During any disease outbreak, epidemiologists want to quickly figure out whether superspreaders are part of the picture. Their existence can accelerate the rate of new infections or substantially expand the geographic distribution of the disease.

The coronavirus pandemic has largely eclipsed the conversation around the opioid crisis. But the crisis still rages on despite business closures, the cancellation of in-person treatment appointments and the strain on many addiction resources.